The below issue description simply must be a bug, does anyone know the bug-ID?

We just upgraded from IFSAPP10 UPD3 to UPD17. 

Since the upgrade a few Customer Order invoices get stuck in state Printed. Analysis results in the conclusion that two posting rows are missing, neither VAT posting nor the AR-account posting are present. Consequently the error message is that the balance in accounting currency is above the set tolerance level. 

This has happened to twelve of 53 invoices for seven customers, never more than two one day, not more than four to one customer. Only one customer has only one invoice during this period, all the others have several invoices with successful postings.